<div class="form-group" fd-property="maxlength">
    <label>最大长度maxlength</label>
    <input type="text" name="maxlength" class="form-control" placeholder="最大长度"/>
</div>
<div class="form-group" fd-property="readonly">
    <label>只读</label>
    <select class="form-control" name="readonly">
        <option value="false">否</option>
        <option value="true">是</option>
    </select>
</div>